/**
 * Copyright (c) 2006-2015, JGraph Ltd
 * Copyright (c) 2006-2015, Gaudenz Alder
 */
/**
 * Class: mxRectangle
 *
 * Extends <mxPoint> to implement a 2-dimensional rectangle with double
 * precision coordinates.
 *
 * Constructor: mxRectangle
 *
 * Constructs a new rectangle for the optional parameters. If no parameters
 * are given then the respective default values are used.
 */
function mxRectangle(x, y, width, height) {
    mxPoint.call(this, x, y);

    this.width = (width != null) ? width : 0;
    this.height = (height != null) ? height : 0;
};

/**
 * Extends mxPoint.
 */
mxRectangle.prototype = new mxPoint();
mxRectangle.prototype.constructor = mxRectangle;

/**
 * Variable: width
 *
 * Holds the width of the rectangle. Default is 0.
 */
mxRectangle.prototype.width = null;

/**
 * Variable: height
 *
 * Holds the height of the rectangle. Default is 0.
 */
mxRectangle.prototype.height = null;

/**
 * Function: setRect
 *
 * Sets this rectangle to the specified values
 */
mxRectangle.prototype.setRect = function (x, y, w, h) {
    this.x = x;
    this.y = y;
    this.width = w;
    this.height = h;
};

/**
 * Function: getCenterX
 *
 * Returns the x-coordinate of the center point.
 */
mxRectangle.prototype.getCenterX = function () {
    return this.x + this.width / 2;
};

/**
 * Function: getCenterY
 *
 * Returns the y-coordinate of the center point.
 */
mxRectangle.prototype.getCenterY = function () {
    return this.y + this.height / 2;
};

/**
 * Function: add
 *
 * Adds the given rectangle to this rectangle.
 */
mxRectangle.prototype.add = function (rect) {
    if (rect != null) {
        var minX = Math.min(this.x, rect.x);
        var minY = Math.min(this.y, rect.y);
        var maxX = Math.max(this.x + this.width, rect.x + rect.width);
        var maxY = Math.max(this.y + this.height, rect.y + rect.height);

        this.x = minX;
        this.y = minY;
        this.width = maxX - minX;
        this.height = maxY - minY;
    }
};

/**
 * Function: intersect
 *
 * Changes this rectangle to where it overlaps with the given rectangle.
 */
mxRectangle.prototype.intersect = function (rect) {
    if (rect != null) {
        var r1 = this.x + this.width;
        var r2 = rect.x + rect.width;

        var b1 = this.y + this.height;
        var b2 = rect.y + rect.height;

        this.x = Math.max(this.x, rect.x);
        this.y = Math.max(this.y, rect.y);
        this.width = Math.min(r1, r2) - this.x;
        this.height = Math.min(b1, b2) - this.y;
    }
};

/**
 * Function: grow
 *
 * Grows the rectangle by the given amount, that is, this method subtracts
 * the given amount from the x- and y-coordinates and adds twice the amount
 * to the width and height.
 */
mxRectangle.prototype.grow = function (amount) {
    this.x -= amount;
    this.y -= amount;
    this.width += 2 * amount;
    this.height += 2 * amount;

    return this;
};

/**
 * Function: getPoint
 *
 * Returns the top, left corner as a new <mxPoint>.
 */
mxRectangle.prototype.getPoint = function () {
    return new mxPoint(this.x, this.y);
};

/**
 * Function: rotate90
 *
 * Rotates this rectangle by 90 degree around its center point.
 */
mxRectangle.prototype.rotate90 = function () {
    var t = (this.width - this.height) / 2;
    this.x += t;
    this.y -= t;
    var tmp = this.width;
    this.width = this.height;
    this.height = tmp;
};

/**
 * Function: equals
 *
 * Returns true if the given object equals this rectangle.
 */
mxRectangle.prototype.equals = function (obj) {
    return obj != null && obj.x == this.x && obj.y == this.y &&
        obj.width == this.width && obj.height == this.height;
};

/**
 * Function: fromRectangle
 *
 * Returns a new <mxRectangle> which is a copy of the given rectangle.
 */
mxRectangle.fromRectangle = function (rect) {
    return new mxRectangle(rect.x, rect.y, rect.width, rect.height);
};